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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11579) Documentation for truncate
Date Wed, 11 Feb 2015 10:06:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315927#comment-14315927
] 

Steve Loughran commented on HADOOP-11579:
-----------------------------------------

+1
Thanks for doing this!

> Documentation for truncate
> --------------------------
>
>                 Key: HADOOP-11579
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11579
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 2.7.0
>            Reporter: Steve Loughran
>            Assignee: Konstantin Shvachko
>         Attachments: HADOOP-11579-01.patch, HDFS-7665.patch
>
>
> With the addition of a major new feature to filesystems, the filesystem specification
in hadoop-common/site is now out of sync. 
> This means that
> # there's no strict specification of what it should do
> # you can't derive tests from that specification
> # other people trying to implement the API will have to infer what to do from the HDFS
source
> # there's no way to decide whether or not the HDFS implementation does what it is intended.
> # without matching tests against the raw local FS, differences between the HDFS impl
and the Posix standard one won't be caught until it is potentially too late to fix.
> The operation should be relatively easy to define (after a truncate, the files bytes
[0...len-1] must equal the original bytes, length(file)==len, etc)
> The truncate tests already written could then be pulled up into contract tests which
any filesystem implementation can run against.



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